Phorodon humuli

Devonshire, A.L., Moores, G.D., and ffrench-Constant, R.H., Detection of insecticide resistance by immunological estimation of carboxylesterase activity in Myzus persicae (Sulzer) and cross reaction of the antiserum with Phorodon humuli (Schrank) (Hemiptera Aphididae), Bull. Ento-mol. Res., 76, 97,1986. 

Its physicochemical properties are quite different than those of spirodidofen 7f and spiromesifen 8a, furthermore spirotetramat 32 effectively acts on a broader spectrum of pests, e.g., it shows an excellent efficacy against different aphid species, including Myzus persicae, Aphis gossypii and Phorodon humuli (Table 28.4.5). 

At least forty different insect species have been recorded as living on the hop, but only a few of these are of economic importance and the control methods necessary to combat these usually keep the others in check. The most serious pest on the hop is the damson-hop aphid or hop-fly Phorodon humuli... 

The damson-hop aphid Phorodon humuli, a pest resistant to all registered insecticides in England, must produce sexual forms to leave hops (Humulus lupulus) for its primary host (Prunus spp.) when the hops are harvested. A single active compound similar to nepetalactol, but presently unidentified, serves as a sexual pheromone (Pickett, 1991). 

Initially it was assumed that plant derived volatiles acted only as insect attractants but now it is clear that they can also have a repellent effect (Pickett et al., 1999) due to stimulation of specific neurones that detect non-host semiochemi-cals (Hori, 1996 Hori and Kamatsu, 1997 Guerrero et al, 1997). Highly specific neurones for isothiocyanates that act as repellents have been found in insects for which brassica are non-hosts, for example, the damson-hop aphid, Phorodon humuli, and the black bean aphid, Aphis fabae (Nottingham et al, 1991). A.fabae olfactory neurones respond to the repellent compound(lR,55)-myrtenal, Fig. 3 (19),released from the nonhost herb savory, Satureja montana (Hardie et al., 1994). 

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